Being famous encompasses a few important functions: it endows the narcissist with power, provides him with a constant Source of Narcissistic Supply (admiration, adoration, approval, awe), and fulfils important Ego functions.
The image that the narcissist projects is hurled back at him, reflected by those exposed to his celebrity or fame. This way he feels alive, his very existence is affirmed and he acquires a sensation of clear boundaries (where the narcissist ends and the world begins).
There is a set of narcissistic behaviours typical to the pursuit of celebrity. There is almost nothing that the narcissist refrains from doing, almost no borders that he hesitates to cross to achieve renown. To him, there is no such thing as "bad publicity" â what matters is to be in the public eye.
(From the book "Malignant Self-love: Narcissism Revisited" by Sam Vaknin - Click on this link to purchase the print book, or 16 e-books, or 2 DVDs with 12 hours of video lectures on narcissists, psychopaths, and abuse in relationships: http://www.narcissistic-abuse.com/thebook.html)